Question

Draw the ray diagram showing the formation of image by convex lens when the object is kept at: (i) focus (F) (ii) between focus (F) and optical centre (O) (iii) at 2F (iv) between F and 2F

Answer 1

i)

O is the object and I is the image.

The image formed is enlarged and it is erect. So the magnification will be positive (+) and greater than 1.

Refer above image. 1

(ii)

O is the object and I is the image.

The image formed is diminished and erect. So the magnification will be positive (+) and less than1.

Refer above image. 2

(iii)

The image will be formed as the 2F on the other side of the lens and it will be of same of the object.

Refer above image. 3

solution